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You shard by user ID. 80% of writes go to 20% of shards because your top customers are assigned to the same shards. Or you shard by date and all writes go to the current month's shard. Uneven distribution turns a scaling solution into a bottleneck.
Test Terraform modules with Terratest, enforce policies with OPA/Conftest, scan with tfsec, and catch infrastructure bugs in CI before deployment.
Prevent algorithm confusion attacks, implement safe key rotation, detect token theft with refresh token families, and secure JWTs with binding and revocation strategies.
Understand JWT stateless tradeoffs, session cookie security, token refresh rotation, and hybrid approaches. Learn when to use JWTs for service-to-service auth and why short TTLs matter.
Build real-time AI systems with Kafka as your event backbone. Ingest features, trigger training, distribute model outputs, and sync data to vector DBs at scale.